Felton
bubble free flowmeter



KR T 8667009 DEF. PUB. P 2, 1969 H. R. FELTON 788/2 5 6 BUBBLE FREE FLOWMETER Filed Dec. 31, 1968 A x x t INVENTOR HERMAN R. FELTON BY W I A'ITORNEY fite i DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11 1968, 849 0.G. 1221. Identiflcation is by serial number of the application and the heading indicates the number of pages of specification, including claims, and of sheets of drawing contained in the application as originally filed. The tile 0! this application is available to the public for inspection reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 2, 1969 788,156 BUBBLE FREE FLOWMETER Herman R. Felton, Wilmington, DeL, assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware Filed Dec. 31, 1968. Published Sept. 2, 1969 Int. Cl. (201E 1/00 US. Cl. 73209 1 Sheet Drawing. 7 Pages Specification In a rotameter, the improvement of adding to the inlet of the rotameter a deformable chamber with a variable volume large enough so that deformation of the chamber will force enough fluid into the rotameter to cause the indicator in the rotameter to move a sufiicient distance to dislodge bubbles adhering to it. 

